package com.auto.netty.http;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;

import java.net.URI;

/*
HttpObject 客户端和服务端相互通讯的数据被封装成 HttpObject
 */
public class HttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {
    /**
     * 读取客户端数据
     *
     * @param ctx
     * @param msg
     * @throws Exception
     */
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
        //判断是不是HttpRequest请求
        if (msg instanceof HttpRequest) {
            System.out.println("msg 类型是：" + msg.getClass());
            System.out.println("客户端地址是：" + ctx.channel().remoteAddress());

            HttpRequest httpRequest= (HttpRequest) msg;
            URI uri = new URI(httpRequest.uri());
            if("/favicon.ico".equals(uri.getPath())){
                System.out.println("访问资源/favicon.ico，不做处理");
                return;
            }

            //响应给浏览器，http协议
            ByteBuf content = Unpooled.copiedBuffer("hello，我是服务器", CharsetUtil.UTF_8);

            //构造一个http响应，即HttpResponse
            FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, content);

            //设置响应头
            response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/html");
            response.headers().set(HttpHeaderNames.CONTENT_LENGTH, content.readableBytes());

            //将构建好的response返回
            ctx.writeAndFlush(response);
        }
    }
}
